Add ReactDOMClient to ServerIntegrationElements

packages/react-dom/src/__tests__/ReactDOMServerIntegrationElements-test.js

@@ -16,19 +16,21 @@ const TEXT_NODE_TYPE = 3;
 
 let React;
 let ReactDOM;
+let ReactDOMClient;
 let ReactDOMServer;
 let ReactTestUtils;
 
 function initModules() {
  jest.resetModules();
  React = require('react');
  ReactDOM = require('react-dom');
+ ReactDOMClient = require('react-dom/client');
  ReactDOMServer = require('react-dom/server');
  ReactTestUtils = require('react-dom/test-utils');
 
  // Make them available to the helpers.
  return {
- ReactDOM,
+ ReactDOMClient,
  ReactDOMServer,
  ReactTestUtils,
  };
@@ -136,7 +138,13 @@ describe('ReactDOMServerIntegration', () => {
  // DOM nodes on the client side. We force it to fire early
  // so that it gets deduplicated later, and doesn't fail the test.
  expect(() => {
- ReactDOM.render(<nonstandard />, document.createElement('div'));
+ ReactDOM.flushSync(() => {
+ const root = ReactDOMClient.createRoot(
+ document.createElement('div'),
+ );
+
+ root.render(<nonstandard />);
+ });
  }).toErrorDev('The tag <nonstandard> is unrecognized in this browser.');
 
  const e = await render(<nonstandard>Text</nonstandard>);